【摘要】：摘要：超級電容器因?yàn)槠涔β拭芏雀�、充電速度快、循環(huán)壽命長,被認(rèn)為下一代儲能設(shè)備的佼佼者之一,已成為電動汽車、電動混合動力汽車輔助動力源的首選。而電極材料對超級電容器電容性能起著決定性的作用,因此由于具有廉價、儲存量大、環(huán)保的特點(diǎn)和優(yōu)異的電化學(xué)性能C0304成為最有應(yīng)用前景的超級電容器電極材料之一。然而,在電極反應(yīng)中,由于Co3O4較低的電導(dǎo)率和電解液進(jìn)入電極微觀結(jié)構(gòu)的困難,界面電荷傳輸受到限制。因此,通過制備納米多孔結(jié)構(gòu)、水滑石結(jié)構(gòu)的材料及與導(dǎo)電性良好的石墨烯、碳納米管復(fù)合等方法來提高導(dǎo)電率離子轉(zhuǎn)移的微觀結(jié)構(gòu)都將成為有效提高C0304電極性能的方法。因此,本論文主要研究內(nèi)容如下： (1)通過溶膠凝膠法制備尖晶石結(jié)構(gòu)的NiCo2O4樣品,通過加入表面活性劑CTAB來改善樣品的表面結(jié)構(gòu)。研究表明,當(dāng)CTAB量為0.025g時得到的樣品結(jié)構(gòu)形貌最好,為三維蜂窩網(wǎng)狀立體結(jié)構(gòu),NiCo2O4樣品上還具有孔隙結(jié)構(gòu),這些特征使得制備材料不但具有良好的導(dǎo)電性,而且反應(yīng)活性位點(diǎn)大大增多,從而提高了材料的比容量和倍率性能。 (2)成功的通過快速成核-水熱法合成出了Co-Al水滑石樣品,且樣品擁有均勻的形貌,厚度在十幾個納米,寬度為200nm的類正六邊形。且Co-Al比例為2：1時得到的樣品電化學(xué)性能最優(yōu)異,比容量達(dá)到450F g-1在0.5A g-1的電流密度時。 (3)用乙醇-水溶液作為溶劑(V乙醇：V水=9：1),四水醋酸鉆為鈷原,通過水解-水熱法合成Co3O4/moCNTs/rmGO復(fù)合物。通過物相,形貌分析,確認(rèn)Co304粒子和moCNT已成功鏈接到石墨烯表面,同時確定了氧化石墨還原為石墨烯。Co3O4/moCNTs/rmGO復(fù)合物表現(xiàn)出優(yōu)異的電化學(xué)性能(502F g-1于0.5A g-1),同時期循環(huán)穩(wěn)定性能也要好于純C0304粒子。
[Abstract]:Absrtact: because of its high power density, high charging speed and long cycle life, supercapacitor is considered as one of the best energy storage equipment in the next generation, and has become the first choice of auxiliary power source for electric vehicles and electric hybrid vehicles. Electrode materials play a decisive role in the capacitive performance of supercapacitors, so C0304 has become one of the most promising electrode materials for supercapacitors because of its low cost, large amount of storage, environmental protection and excellent electrochemical performance. However, in the electrode reaction, the interfacial charge transfer is limited due to the low conductivity of Co3O4 and the difficulty of electrolyte entering the electrode microstructure. Therefore, the preparation of nano-porous structure, hydrotalcite-structured materials and the combination of graphene with good conductivity, carbon nanotubes and other methods to improve the conductivity of ion transfer microstructure will become an effective way to improve the performance of C0304 electrode. Therefore, the main contents of this thesis are as follows: (1) Spinel NiCo2O4 samples were prepared by sol-gel method, and the surface structure of the samples was improved by adding surfactant CTAB. The results show that when the CTAB content is 0.025 g, the morphology of the sample is the best, and the pore structure is also found on the sample with three-dimensional honeycomb net structure, which makes the prepared material not only have good electrical conductivity, but also have good electrical conductivity. Moreover, the number of reactive sites increased greatly, which improved the specific capacity and performance of the materials. (2) Co-Al hydrotalcite samples were successfully synthesized by rapid nucleation and hydrothermal method, and the samples had uniform morphology. The thickness of a dozen nanometers, width of 200nm like hexagon. When the Co-Al ratio was 2:1, the electrochemical properties of the samples were the best. When the specific capacity reached 450 F g ~ (-1) and the current density was 0.5 A g ~ (-1). (3) ethanol aqueous solution was used as solvent (V ethanol: v water 9: 1), and acetic acid tetrahydrate was drilled into cobalt proto. Co3O4/moCNTs/rmGO complex was synthesized by hydrolysis-hydrothermal method. The results of phase and morphology analysis show that Co304 particles and moCNT have been successfully linked to graphene surface. At the same time, the reduction of graphite oxide to graphene. Co3O4 / moCNTsrmGO complex showed excellent electrochemical properties (502Fg-1 to 0.5Ag-1), and the cyclic stability of the composite was better than that of pure C0304 particles at the same time.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM53;O611.4

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相關(guān)期刊論文 前1條

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本文編號：2155411